JPH04107248A - Manufacture of galvannealed steel sheet - Google Patents
Manufacture of galvannealed steel sheetInfo
- Publication number
- JPH04107248A JPH04107248A JP22782090A JP22782090A JPH04107248A JP H04107248 A JPH04107248 A JP H04107248A JP 22782090 A JP22782090 A JP 22782090A JP 22782090 A JP22782090 A JP 22782090A JP H04107248 A JPH04107248 A JP H04107248A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- zinc
- hot
- layer
- alloying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910000831 Steel Inorganic materials 0.000 title abstract description 16
- 239000010959 steel Substances 0.000 title abstract description 16
- 238000007747 plating Methods 0.000 claims abstract description 35
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000011701 zinc Substances 0.000 claims abstract description 30
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 30
- 238000005275 alloying Methods 0.000 claims abstract description 25
- 239000010410 layer Substances 0.000 claims abstract description 23
- 239000002344 surface layer Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 19
- 239000008397 galvanized steel Substances 0.000 claims description 19
- 239000002253 acid Substances 0.000 claims description 11
- 238000005246 galvanizing Methods 0.000 abstract description 21
- 230000007547 defect Effects 0.000 abstract description 11
- 238000005554 pickling Methods 0.000 abstract description 10
- 238000002844 melting Methods 0.000 abstract description 4
- 230000008018 melting Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 229910001297 Zn alloy Inorganic materials 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、めっき皮膜表面の美麗な合金化溶融亜鉛めっ
き鋼板を製造する方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing an alloyed hot-dip galvanized steel sheet with a beautiful plating film surface.
（従来の技術）
近年、自動車をはじめ、建材、家電などの分野において
表面処理鋼板の使用量が益々増加する傾向にあり、それ
にともない要求性能が厳しくなってきている。(Prior Art) In recent years, the amount of surface-treated steel sheets used has been increasing in the fields of automobiles, building materials, home appliances, etc., and the required performance has become stricter accordingly.
自動車用防錆鋼板を例にとれば、冬季に溶雪塩を散布す
る北米等では高耐食性を有する表面処理鋼板が求められ
ている。その対策として、従来がら自動車用防錆鋼板と
して用いられている電気亜鉛系合金めっき鋼板や合金化
溶融亜鉛めっき鋼板などの表面処理鋼板の目付は量を増
加することが検討されている。特に、電気めっき鋼板に
比べ、安価であり、且つ目付は量の増加によるコスト上
昇が比較的小さな合金化溶融亜鉛めっき鋼板の使用によ
り高耐食性の鋼板を製造することが検討されている。Taking anticorrosion steel sheets for automobiles as an example, in North America and other countries where melting snow salt is sprayed in the winter, surface-treated steel sheets with high corrosion resistance are required. As a countermeasure, it is being considered to increase the basis weight of surface-treated steel sheets such as electrogalvanized alloy-plated steel sheets and alloyed hot-dip galvanized steel sheets, which have been conventionally used as rust-proof steel sheets for automobiles. In particular, it is being considered to produce a highly corrosion-resistant steel sheet by using an alloyed hot-dip galvanized steel sheet, which is cheaper than an electroplated steel sheet and whose cost increase due to increase in area weight is relatively small.
合金化溶融亜鉛めっき鋼板は、溶融亜鉛めっき後の鋼板
を合金化炉で５５０°Ｃ前後の温度に加熱し、合金化処
理することにより製造される。従来、この合金化処理で
は、溶融亜鉛めっき層と鋼素地との間に相互拡散を行わ
しめ、めっき層全体をＦｅ −Ｚｎ合金としており、め
っき層中の平均Ｆｅ含有量が１０％程度となるように管
理している。An alloyed hot-dip galvanized steel sheet is manufactured by heating a hot-dip galvanized steel sheet to a temperature of about 550° C. in an alloying furnace and subjecting it to alloying treatment. Conventionally, in this alloying process, mutual diffusion occurs between the hot-dip galvanized layer and the steel base, and the entire plating layer is made of Fe-Zn alloy, and the average Fe content in the plating layer is about 10%. It is managed as follows.
（発明が解決しようとする課題）
合金化溶融亜鉛めっき鋼板は、塗装性、塗膜の密着性、
溶接性などに優れた特徴を有するが、電気めっき鋼板に
比べ、皮膜欠陥が多いという問題がある。皮膜欠陥の多
くは合金化熔融亜鉛めっき銅板の製造過程において混入
する異物により発生する。異物には種々のものがあるが
、皮膜欠陥の主原因となる異物は溶融亜鉛めっき浴中に
存在するドロスである。溶融亜鉛めっきでは浴中を通過
するストリップからＦｅが溶出し、浴中の亜鉛と反応し
て金属間化合物を形成する。この金属間化合物がめつき
槽の底部に堆積したものがいわゆるボトムドロスである
が、合金化溶融亜鉛めっき鋼板の場合には、合金化しな
い熔融亜鉛めっき鋼板に比べＦｅの溶出量が高く、ボト
ムドロスが発生しやすい状況にある。これは浴中のＡ１
濃度を高くするとめっき皮膜中のＡＩ濃度が高くなり、
それが合金化反応を抑制するので、合金化溶融亜鉛めっ
き鋼板の製造においては、Ａｌｆ１４度の低い溶融亜鉛
めっき浴を用いており、このようなＡｌ１度の低い溶融
亜鉛めっき浴ではＦｅの溶出量が増加する。(Problem to be solved by the invention) The alloyed hot-dip galvanized steel sheet has excellent paintability, adhesion of the coating film,
Although it has excellent weldability, it has the problem of more film defects than electroplated steel sheets. Many of the coating defects are caused by foreign matter mixed in during the manufacturing process of alloyed hot-dip galvanized copper sheets. There are various types of foreign matter, but the foreign matter that is the main cause of film defects is dross present in the hot-dip galvanizing bath. In hot-dip galvanizing, Fe is eluted from the strip passing through the bath and reacts with zinc in the bath to form an intermetallic compound. This intermetallic compound deposited at the bottom of the plating bath is called bottom dross, but in the case of alloyed hot-dip galvanized steel sheets, the amount of Fe eluted is higher than that of non-alloyed hot-dip galvanized steel sheets, resulting in bottom dross. I am in a comfortable situation. This is A1 in the bath
When the concentration is increased, the AI concentration in the plating film increases,
Because it suppresses the alloying reaction, a hot dip galvanizing bath with a low AlF of 14 degrees is used in the production of alloyed hot dip galvanized steel sheets, and in such hot dip galvanizing baths with a low Al of 1 degree, the amount of Fe elution is reduced. increases.
ボトムドロスは、溶融亜鉛めっきの際に浴中のジンクロ
ールの下部付近で生しるストリップの随伴流によって巻
き上げられ、めっき皮膜中に取り込まれたり、めっき皮
膜表面に付着する。ボトムドロスは、定期的に設備を停
止し、かき出し除去（ドロッシング）を行っているが、
この回収除去作業では設備停止前には浴中ドロス濃度が
上がり、ドロスがめつき皮膜中に取り込まれたり、めっ
き皮膜表面に付着する確率が高くなる。また、ドロス以
外の異物による皮膜欠陥に対しては、合金化炉以降のラ
インを清浄にすることで皮膜欠陥の発生を防止している
が、異物による皮膜欠陥を完全になくするまでには至っ
ていないのが実状である。Bottom dross is rolled up by the flow of the strip generated near the bottom of the zinc roll in the bath during hot-dip galvanizing, and is incorporated into the plating film or attached to the surface of the plating film. Bottom dross is removed by scraping it out (droshing) by periodically stopping the equipment.
In this recovery and removal work, the dross concentration in the bath increases before the equipment is stopped, increasing the probability that the dross will be incorporated into the plating film or adhere to the surface of the plating film. In addition, film defects caused by foreign matter other than dross are prevented by cleaning the line after the alloying furnace, but it has not yet been possible to completely eliminate film defects caused by foreign matter. The reality is that there is none.
合金化溶融亜鉛めっきｗ４仮のめつき皮膜に、上記のよ
うな異物による欠陥が発生すると、めっき皮膜の表面性
状が悪化する０表面性状に劣る合金化溶融亜鉛めっき鋼
板は、塗装後の美麗さが求められる自動車の外装用には
使用することができない。Alloyed hot-dip galvanized steel sheet w4 If defects caused by foreign substances such as those mentioned above occur in the temporary plating film, the surface quality of the plating film will deteriorate. It cannot be used for the exterior of automobiles that require
本発明の！ＩＩ！ｌは、異物によるめっき皮膜欠陥問題
を解消することにある。即ち、本発明の目的は、めっき
皮膜表面が美麗な合金化溶融亜鉛めっき鋼板を製造する
ことができる方法を提供することにある。The invention! II! The objective is to eliminate the problem of plating film defects caused by foreign matter. That is, an object of the present invention is to provide a method for producing an alloyed hot-dip galvanized steel sheet with a beautiful plating film surface.
（！！Ｉ題を解決するための手段）
本発明者らは、めっき皮膜中に異物が存在する溶融亜鉛
めっき鋼板を、めっき層全体がＦｅ −Ｚｎ合金となる
まで合金化処理することなく、合金化処理を途中で停止
し、表層に亜鉛が残っている状態にし、その表層の亜鉛
を酸により溶解すると、異物も一緒に取り除かれ、表面
が美麗な合金化溶融亜鉛めっき鋼板になることを見出し
た。(!!Means for Solving Problem I) The present inventors have solved the problem without alloying a hot-dip galvanized steel sheet in which foreign matter is present in the plating film until the entire plating layer becomes an Fe-Zn alloy. When the alloying process is stopped mid-way, zinc remains on the surface layer, and the surface zinc is dissolved with acid, foreign matter is removed along with it, resulting in an alloyed hot-dip galvanized steel sheet with a beautiful surface. I found it.
ここに本発明は［溶融亜鉛めっき後の鋼板を加熱し、表
層に亜鉛が残るようにめっき層を合金化処理した後、表
層の亜鉛を酸により溶解除去することを特徴とする合金
化溶融亜鉛めっきｍｔｉの製造方法Ｊを要旨とする。Herein, the present invention provides [alloyed molten zinc characterized by heating a steel sheet after hot-dip galvanizing, alloying the plating layer so that zinc remains on the surface layer, and then dissolving and removing the zinc on the surface layer with acid. The gist is method J for manufacturing plating mti.
（作用） 以下、添付図面を用いて本発明の詳細な説明する。(effect) Hereinafter, the present invention will be described in detail using the accompanying drawings.
第１図は、本発明方法を実施する熔融亜鉛めっきライン
の一例を示した概略図である。FIG. 1 is a schematic diagram showing an example of a hot-dip galvanizing line that implements the method of the present invention.
図中１はストリップ、２はスナウト、３はめっき槽、４
は溶融亜鉛めっき浴、５はジンクロール、６は案内ロー
ル、７はガスワイピングノズル、８は合金化炉、９はト
ップロール、１０はデフレクタロールであり、この溶融
亜鉛めっきラインには前記デフレクタロール１０の後方
に酸洗槽１１が配置されている。In the figure, 1 is the strip, 2 is the snout, 3 is the plating tank, and 4
is a hot-dip galvanizing bath, 5 is a zinc roll, 6 is a guide roll, 7 is a gas wiping nozzle, 8 is an alloying furnace, 9 is a top roll, 10 is a deflector roll, and this hot-dip galvanizing line includes the deflector roll. A pickling tank 11 is arranged behind the pickling tank 10 .
ストリップ１はスナウト２を介して溶融亜鉛浴４に浸漬
され、浴中のジンクロール５により上方に進行方向が変
えられ、案内ロール６により導かれて浴上に引き上げら
れることにより、その表面に溶融亜鉛めっきが施される
。溶融亜鉛めっき後のストリップ１は、ガスワイピング
ノズル７より吹き付けられる高圧ガスにより目付は量が
調整された後、合金化炉８に入る。The strip 1 is immersed in a molten zinc bath 4 through a snout 2, directed upward by a zinc roll 5 in the bath, guided by a guide roll 6 and pulled up above the bath, thereby depositing molten zinc on its surface. Galvanized. After hot-dip galvanizing, the strip 1 enters the alloying furnace 8 after its basis weight is adjusted by high-pressure gas sprayed from the gas wiping nozzle 7.
本発明では、このときの目付は量は最終的に必要とする
めっき皮膜厚より厚くする０例えば、最終的に必要なめ
っき皮膜厚が６０ｇ／ｍ”である場合、目付は量はこれ
よりも４０ｇ／ｍ”厚くする。In the present invention, the basis weight at this time is set to be thicker than the final required plating film thickness.For example, if the final required plating film thickness is 60g/m'', the basis weight is set to be thicker than this. 40g/m” thicker.
合金化炉８では、溶融亜鉛めっき後のストリップ１を加
熱し、合金化処理を行う。本発明では、このとき、従来
のようにめっき層全体をＦｅ−Ｚｎ合金に合金化するの
ではなく、ヒートパターンを調整してめっき層の表層に
亜鉛が残るように合金化を行う、即ち、ここでは、最終
的に必要な皮膜厚より厚く調整しためっき層を、表層に
亜鉛が残るように表層を除く部分（最終製品において必
要とする部分）をＰｅ −Ｚｎ合金に合金化するのであ
る。In the alloying furnace 8, the hot-dip galvanized strip 1 is heated and alloyed. In the present invention, at this time, instead of alloying the entire plating layer with Fe-Zn alloy as in the conventional method, the heat pattern is adjusted so that zinc remains on the surface layer of the plating layer, that is, Here, the plating layer is adjusted to be thicker than the final required film thickness, and the portion excluding the surface layer (the portion required in the final product) is alloyed with a Pe-Zn alloy so that zinc remains on the surface layer.
こうすることによって、溶融亜鉛めっき浴中又は合金化
炉内に至る過程でめっき層に取り込まれた異物が表層の
亜鉛中に存在するようになり、次の酸洗処理で表層の亜
鉛を溶解してやれば、異物も一緒に取り除かれる。めっ
き層に取り込まれた異物が表層の亜鉛中に存在するよう
になる詳細な理由は不明であるが、異物と合金化層とは
反応性が乏しいことから、めっき層に取り込まれた異物
が、合金化が進んでいない亜鉛中に押し出されるためで
あると考えられる。従って、表層に亜鉛を残してめっき
層を合金化すると、めっき層に取り込まれた異物は表層
の亜鉛中に存在するようになる。By doing this, foreign matter that was taken into the plating layer during the process of entering the hot-dip galvanizing bath or the alloying furnace will be present in the surface zinc, and the next pickling treatment will dissolve the surface zinc. If so, foreign objects will also be removed. The detailed reason why the foreign matter taken into the plating layer becomes present in the surface zinc layer is unknown, but since foreign matter and the alloyed layer have poor reactivity, the foreign matter taken into the plating layer is This is thought to be because it is extruded into the zinc, which is not yet alloyed. Therefore, if the plating layer is alloyed with zinc remaining in the surface layer, the foreign matter taken into the plating layer will be present in the zinc in the surface layer.
合金化処理後のストリフプ１は、トップロール９および
デフレフクーロール１０を経て酸洗槽１１に入る。酸洗
槽１１では合金化層を残して表層の亜鉛のみを酸で溶解
し、最終的な皮膜厚にする。酸としては塩酸や硫酸など
の強酸を希釈したものを使用するのが望ましい、また、
酸洗では合金化層までも溶解しないように溶解を制御す
る必要がある。After the alloying treatment, the strip 1 passes through a top roll 9 and a deflation cooler roll 10, and then enters a pickling tank 11. In the pickling tank 11, only the zinc on the surface layer is dissolved with acid, leaving the alloyed layer, to obtain the final film thickness. As the acid, it is preferable to use a diluted strong acid such as hydrochloric acid or sulfuric acid.
During pickling, it is necessary to control the dissolution so that even the alloyed layer does not dissolve.
溶解の制御としては、処理時間を調整するか、インヒビ
ター（酸腐食抑制剤）を添加するのがよい。To control dissolution, it is preferable to adjust the treatment time or add an inhibitor (acid corrosion inhibitor).
こうして酸で表層の亜鉛のみを溶解すれば、表層の亜鉛
に存在する異物および合金化処理後に付着した異物も同
時に取り除かれるので、酸洗後に行われる調質圧延で異
物が押し込まれて皮膜欠陥となることがない。In this way, if only the surface layer zinc is dissolved with acid, the foreign matter present in the surface zinc layer and the foreign matter that has adhered after the alloying treatment will also be removed at the same time, so that the foreign matter will be pushed in during the temper rolling performed after pickling and cause film defects. It never becomes.
（実施例１）
ＡＩ濃度０．１％の溶融亜鉛めっき浴でめっきした溶融
亜鉛めっき鋼板（目付は量１００ｇ／ｍ”）を供試材と
した。この供試材のめっき皮Ｍ１ｍ”当たりに存在する
異物の個数をかぞえた後、第２図の曲線Ａで示すヒート
パターンで表層に亜鉛が残るようにめっき層を合金化処
理した０合金化処理後は表層の亜鉛を５％のインヒビタ
ー（胡日化学工業株式会社製 酸腐食抑制削イビノト）
を含む１０％ｌＩｃ１で溶解した。溶解後の目付は量は
６０ｇ／ｍ”である。(Example 1) A hot-dip galvanized steel sheet (fabric weight: 100 g/m") plated in a hot-dip galvanizing bath with an AI concentration of 0.1% was used as a test material. After counting the number of foreign particles present, the plating layer was alloyed using the heat pattern shown by curve A in Figure 2 so that zinc remained on the surface layer. Manufactured by Hu Ni Chemical Industry Co., Ltd. Acid corrosion suppression cutting material)
It was dissolved in 10% lIc1 containing. The basis weight after dissolution is 60 g/m''.
次いで、表面をはけで払った後、残存する異物の個数を
調べた。Next, after brushing the surface, the number of remaining foreign particles was examined.
従来例として、同様の供試材のめつき皮膜１ｍ”当たり
に存在する異物の個数をかぞえた後、５５０°Ｃの温度
域を本発明例より１０秒間長く保持する第２図の曲ｉＢ
で示すヒートパターンでめっき層全体を合金化処理し、
皮膜に残存する異物の個数を調べた。これらの調査結果
を第１表に示す。As a conventional example, after counting the number of foreign particles present per 1 m'' of plating film on a similar test material, the temperature range of 550°C was maintained for 10 seconds longer than in the present invention example.
The entire plating layer is alloyed using the heat pattern shown in
The number of foreign substances remaining on the film was examined. The results of these investigations are shown in Table 1.
第 １ 表
（注）本：本発明例、従：従来例
第１表から、本発明例では合金化処理後には異物が著し
く減少していることがわかる。なお、従来法でも合金化
処理後には異物は減少しでいるが、これは異物がめつき
皮膜と反応せず、合金化の進行とともに皮膜表面に押し
出され、皮膜表面から剥離するものがあるからと推定さ
れる。Table 1 (Note) Main: Examples of the present invention, Comparative examples: Conventional examples From Table 1, it can be seen that in the examples of the present invention, the amount of foreign matter was significantly reduced after the alloying treatment. In addition, even with the conventional method, the amount of foreign matter decreases after alloying treatment, but this is because some foreign matter does not react with the plated film and is pushed out to the surface of the film as alloying progresses, and some of it peels off from the surface of the film. Presumed.
（実施例２）
第１図に示す溶融めっきラインを使用し、下記の条件で
合金化溶融亜鉛めっき鋼板を製造した。(Example 2) Using the hot-dip plating line shown in FIG. 1, an alloyed hot-dip galvanized steel sheet was manufactured under the following conditions.
〔溶融亜鉛めっき］
Ａｌｆｉ度０．０９〜０．１％、溶点４７０°Ｃの溶融
亜鉛めっき浴を使用し、溶融亜鉛めっき後はガスワイピ
ングノズＪしにより目イ寸は量を８５〜１００ ｇ／ｍ
ｆｆ１に富周整。[Hot-dip galvanizing] Use a hot-dip galvanizing bath with an Alfi degree of 0.09 to 0.1% and a melting point of 470°C, and after hot-dip galvanizing, use a gas wiping nozzle to adjust the measurement size to 85 to 100. g/m
Fushu Sei on ff1.
〔合金化処理］ 第３図に示すヒートパタンで行い、表層に亜鉛を残す。[Alloying treatment] The heat pattern shown in Figure 3 is used to leave zinc on the surface layer.
２％のインヒビター（耕日化学工業株式会社製酸腐食抑
制剤イビノ日を含む１０％ＨＣＩ！の酸を使用し、約５
秒間処理して表層の亜鉛を溶解。熔解後の目付は量は４
５〜６０ｇ／ｍ”。Using 10% HCI! acid containing 2% inhibitor (acid corrosion inhibitor Ivinohi manufactured by Koichi Chemical Co., Ltd.), approx.
Process for seconds to dissolve surface zinc. The basis weight after melting is 4.
5-60g/m”.
上記条件で２万トンの合金化溶融亜鉛めっき鋼板を製造
した結果、異物による皮膜欠陥は見られなかった。As a result of producing 20,000 tons of alloyed hot-dip galvanized steel sheet under the above conditions, no film defects due to foreign matter were observed.
（発明の効果）
本発明方法によれば、異物による皮膜欠陥が少なく、皮
膜表面が美麗な合金化溶融亜鉛めっき鋼板を得ることが
できる。(Effects of the Invention) According to the method of the present invention, it is possible to obtain an alloyed hot-dip galvanized steel sheet with fewer coating defects due to foreign matter and a beautiful coating surface.
第１図は、本発明方法を実施する連続式溶融亜鉛めっき
ラインの一例を示す概略図、
第２図は、実施例１で採用した合金化処理のヒートパタ
ーンを示す図、
第３図は実施例２で採用した合金化処理のヒートパター
ンを示す図、である。
１ニストリツプ、３；めっき槽、４：溶融亜鉛めっき浴
、８：合金化炉、ＩＩ：酸洗槽。Fig. 1 is a schematic diagram showing an example of a continuous hot-dip galvanizing line that implements the method of the present invention; Fig. 2 is a diagram showing the heat pattern of the alloying treatment adopted in Example 1; Fig. 3 is a diagram showing the implementation 3 is a diagram showing a heat pattern of alloying treatment adopted in Example 2. FIG. 1 strip, 3: plating tank, 4: hot-dip galvanizing bath, 8: alloying furnace, II: pickling tank.
Claims (1)
うにめっき層を合金化処理した後、表層の亜鉛を酸によ
り溶解除去することを特徴とする合金化溶融亜鉛めっき
鋼板の製造方法。A method for producing an alloyed hot-dip galvanized steel sheet, which comprises heating a hot-dip galvanized steel sheet, alloying the plating layer so that zinc remains on the surface layer, and then dissolving and removing the surface zinc with acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22782090A JPH04107248A (en) | 1990-08-28 | 1990-08-28 | Manufacture of galvannealed steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22782090A JPH04107248A (en) | 1990-08-28 | 1990-08-28 | Manufacture of galvannealed steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04107248A true JPH04107248A (en) | 1992-04-08 |
Family
ID=16866891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22782090A Pending JPH04107248A (en) | 1990-08-28 | 1990-08-28 | Manufacture of galvannealed steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04107248A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012132098A (en) * | 2010-12-01 | 2012-07-12 | Sumitomo Metal Ind Ltd | Galvanized heat-treated steel material, and method for manufacturing the same |
-
1990
- 1990-08-28 JP JP22782090A patent/JPH04107248A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012132098A (en) * | 2010-12-01 | 2012-07-12 | Sumitomo Metal Ind Ltd | Galvanized heat-treated steel material, and method for manufacturing the same |
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